diff options
Diffstat (limited to 'src/test')
| -rw-r--r-- | src/test/test-pty.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/src/test/test-pty.c b/src/test/test-pty.c new file mode 100644 index 0000000000..73c5c85330 --- /dev/null +++ b/src/test/test-pty.c @@ -0,0 +1,143 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2014 David Herrmann <dh.herrmann@gmail.com> + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <errno.h> +#include <fcntl.h> +#include <locale.h> +#include <string.h> +#include <sys/wait.h> +#include <unistd.h> + +#include "def.h" +#include "pty.h" +#include "util.h" + +static const char sndmsg[] = "message\n"; +static const char rcvmsg[] = "message\r\n"; +static char rcvbuf[128]; +static size_t rcvsiz = 0; +static sd_event *event; + +static void run_child(Pty *pty) { + int r, l; + char buf[512]; + + r = read(0, buf, sizeof(buf)); + assert_se(r == strlen(sndmsg)); + assert_se(!strncmp(buf, sndmsg, r)); + + l = write(1, buf, r); + assert_se(l == r); +} + +static int pty_fn(Pty *pty, void *userdata, unsigned int ev, const void *ptr, size_t size) { + switch (ev) { + case PTY_DATA: + assert_se(rcvsiz < strlen(rcvmsg) * 2); + assert_se(rcvsiz + size < sizeof(rcvbuf)); + + memcpy(&rcvbuf[rcvsiz], ptr, size); + rcvsiz += size; + + if (rcvsiz >= strlen(rcvmsg) * 2) { + assert_se(rcvsiz == strlen(rcvmsg) * 2); + assert_se(!memcmp(rcvbuf, rcvmsg, strlen(rcvmsg))); + assert_se(!memcmp(&rcvbuf[strlen(rcvmsg)], rcvmsg, strlen(rcvmsg))); + } + + break; + case PTY_HUP: + /* This is guaranteed to appear _after_ the input queues are + * drained! */ + assert_se(rcvsiz == strlen(rcvmsg) * 2); + break; + case PTY_CHILD: + /* this may appear at any time */ + break; + default: + assert_se(0); + break; + } + + /* if we got HUP _and_ CHILD, exit */ + if (pty_get_fd(pty) < 0 && pty_get_child(pty) < 0) + sd_event_exit(event, 0); + + return 0; +} + +static void run_parent(Pty *pty) { + int r; + + /* write message to pty, ECHO mode guarantees that we get it back + * twice: once via ECHO, once from the run_child() fn */ + assert_se(pty_write(pty, sndmsg, strlen(sndmsg)) >= 0); + + r = sd_event_loop(event); + assert_se(r >= 0); +} + +static void test_pty(void) { + pid_t pid; + Pty *pty; + + rcvsiz = 0; + memset(rcvbuf, 0, sizeof(rcvbuf)); + + assert_se(sd_event_default(&event) >= 0); + + pid = pty_fork(&pty, event, pty_fn, NULL, 80, 25); + assert_se(pid >= 0); + + if (pid == 0) { + /* child */ + run_child(pty); + exit(0); + } + + /* parent */ + run_parent(pty); + + /* Make sure the PTY recycled the child; yeah, this is racy if the + * PID was already reused; but that seems fine for a test. */ + assert_se(waitpid(pid, NULL, WNOHANG) < 0 && errno == ECHILD); + + pty_unref(pty); + sd_event_unref(event); +} + +int main(int argc, char *argv[]) { + unsigned int i; + + log_parse_environment(); + log_open(); + + assert_se(sigprocmask_many(SIG_BLOCK, SIGCHLD, -1) >= 0); + + /* Oh, there're ugly races in the TTY layer regarding HUP vs IN. Turns + * out they appear only 10% of the time. I fixed all of them and + * don't see them, anymore. But lets be safe and run this 1000 times + * so we catch any new ones, in case they appear again. */ + for (i = 0; i < 1000; ++i) + test_pty(); + + return 0; +} |